Improvement in rock-drills



2 Sheets--Sheet l- M STANNARD & J. R. REYNOLDS.

Rock-Drill.

Patented May 7,1872.

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MONROE STANNARD AND JOHN R. REYNOLDS, OF HARTFORD, CONNECTICUT, ASSIGNORS TO ALBERT T. RAND, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN ROCK-DRILLS.

Specification forming part of Letters Patent No. 126,422, dated May 7, 1872.

To all whom it may concern:

Be it known that we, MONROE STANNARD and JOHN R. REYNOLDS, of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Rock-Drills; and we do hereby declare that the following is a full, clear, and exact description thereof, whereby a person skilled in the art can make and use the same, reference being had to the accompanying drawing and to the letters of reference marked thereon.

Like letters in the figures indicate the same parts.

Nature and Objects of the Invention.

Our invention consists in arranging the several parts already in common use for rockdrills, in a better and more convenient form than has heretofore been done, whereby the stoppages and accidents so common in their use is avoided.

Description of the Accompanying Drawing.

Sheet No. 1Figure 1 is a side view of a drill having my improvements. Fig. 2 is a top view of the same.

Sheet No. 2-Figure 3 is a longitudinal section through the middle of the machine. Fig. 4 is a section on the line as, showing the arran gement for rotating the drill. Fig. 5 is an end view of the wheel H detached, viewed from the end next to the body of the machine. Fig. 6 is an end view of the wheel I detached, viewed from the end next to the body of the machine. Fig. 7 is an end view of the clutch J.

A is the frame of the machine. B is the driving-cylinder, to be used with steam or compressed air, and is attached to the frame A. C is the slide-valve for operating it. F is the drill-shaft passing through the ratchet-wheel G and the geared wheel H. I is a wheel gearing into E and driven by it, running loosely on the shaft of the screw S. J is a clutch splined onto the screw S and turning with it. K is a nut through which the screw S passes. This nut is fixed to the bed L, upon which the frame of the machine slides through the guides t t at the sides. M is a box, in which the shaft of the screw turns freely, but cannot move endwise. N is a circular dovetailed projection, by which the machine is attached to its tripod or support.

General Description.

The cylinder 13 operates in the usual manner by the slide-valve C. The drill-shaft F has in its surface two spiral splines or grooves and one straight longitudinal one. The curved splines are for rotating the drill, which is done in the following manner: The ratchet-wheel G has upon it two feathers, i i, shown in Fig. 4, which enter into the spiral splines on the drill-shaft. When the drill is thrown forward, the friction of the drill-shaft being greater than that of the ratchet-wheel G, tne latter turns under the pawl h and allows the drillshaft to move straight forward. When the drill is withdrawn the ratchet G is held by the pawl h and the drill-shaft is obliged to turn. The straight spline in the drill shaft runs through the wheel H, which has a feather entering into it, so that the shaft F can move freely through H, but when it turns it carries the wheel with it. j is a friction-clamp for increasing the friction to prevent the turning of the drill shaft, if necessary. The wheel H drives the wheel I. This latter has on the further end of its axis, at k, suitable projections to enter the clutch J when that is pressed against it. This wheel I runs loose on the shaft of the screw S and does not turn it, except when connected with the clutch J. The clutch J is splined onto the shaft of the screw S and turns with it. It serves the purpose of connecting the screw with the rotating wheel I to turn the screw and advance the frame of the machine. This is regulated by the penetration of the drill into the rock, and is effected as follows: The trigger 1 holds the dog m,which rests against it until the drill-shaft F reaches the extreme end of its stroke and brings the annular projection n in contact with the trigger. It is then tripped from the dog m, and the rod 0 advances under the influence of the spring 10, carrying with it the clutch J. This looks into the wheel I and the screw turns. On the inner side of I there is a cam, q, having a gradually-inclined surface to throw back the rod 0 to its first position. This is accomplished at one revolution of the wheel I or screw S, so that the frame is advanced one revolution or less of the screw, according to the position of the cam when the rod is tripped. When the rod is pushed back the trigger catches and holds it as before. The screw S has a cranksquare, r, at its end, for the purpose of adjusting the position of the machine by turning the screw independently of the feeding mechanism.

The operation of the machine is as follows: The drill is inserted in the end of the drillshaft and the machine placed in position. It

, the clutch J is connected with the wheel I the rod 0 is drawn back by the ring 8 and the frame of the machine placed in the proper position forward by means of a crank at r for turning the screw. It is placed so that the drill will just reach the rock when the piston in B is at the forward end of its stroke. \Vhen the machine is set in motion, if the drill-shaft passes far enough forward to release the trigger l, the frame is advanced one turn or less by the mechanism already described. At the next stroke the ring 22 will probably not reach the trigger, as the frame has advanced and the drill has not penetrated the same distance.

When it has done so the frame will be again advanced.

Claim.

\Ve claim as our invention- 1. The combination of the straight spline on the drill-shaft, the wheels H and I, and the clutch J, for communicating a rotary motion from the drill-shaft F to the screw S, substantially as described.

2. The wheel I, with its cam q and projections k, in combination with the rod 0 and the clutch J on the screw S, for operating the feeding mechanism, substantially as described.

3. The combination of the wheel I, clutch J, rod 0, dog m, and spring 12, with the trigger I, when constructed and arranged in the manner described.

MONROE STANNARD. JNO. R. REYNOLDS.

\Vitnesses:

FRANCIS A. PRATT, E. G. PARKHUns'r. 

